Exclusive γγ → μ + μ − production in proton-proton collisions at s√=7 TeV

Authors

The CMS Collaboration
S. Chatrchyan, Yerevan Physics Institute
V. Khachatryan, Yerevan Physics Institute
Marc M. Baarmand, Florida Institute of Technology
B. Dorney, Florida Institute of Technology
Marcus Hohlmann, Florida Institute of Technology
Himali Kalakhety, Florida Institute of Technology
Igor Vodopiyanov, Florida Institute of Technology

Document Type

Article

Publication Title

Journal of High Energy Physics

Abstract

A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at s=7" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=7�=7 TeV, pp → pμ ⁺ μ ⁻p, is reported using data corresponding to an integrated luminosity of 40 pb⁻¹. For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum p T (μ) > 4 GeV and pseudorapidity |η(μ)| < 2.1, a fit to the dimuon p T (μ ⁺ μ ⁻) distribution results in a measured cross section of σ(p → pμ ⁺ μ ⁻p) = 3.38−0.55+0.58" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">3.38+0.58−0.553.38−0.55+0.58 (stat.) ± 0.16 (syst.) ± 0.14 (lumi.) pb, consistent with the theoretical prediction evaluated with the event generator LPAIR. The ratio to the predicted cross section is 0.83−0.13+0.58" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">0.83+0.58−0.130.83−0.13+0.58 (stat.) ± 0.04 (syst.) ± 0.03 (lumi.). The characteristic distributions of the muon pairs produced via γγ fusion, such as the muon acoplanarity, the muon pair invariant mass and transverse momentum agree with those from the theory.

DOI

doi.org/10.1007/JHEP01(2012)052

Publication Date

2012

Recommended Citation

The CMS collaboration., Chatrchyan, S., Khachatryan, V. et al. Exclusive γγ → μ + μ − production in proton-proton collisions at s√=7 TeV. J. High Energ. Phys. 2012, 52 (2012). https://doi.org/10.1007/JHEP01(2012)052